US6500306B2 - Arrangement with white water channel - Google Patents
Arrangement with white water channel Download PDFInfo
- Publication number
- US6500306B2 US6500306B2 US09/876,370 US87637001A US6500306B2 US 6500306 B2 US6500306 B2 US 6500306B2 US 87637001 A US87637001 A US 87637001A US 6500306 B2 US6500306 B2 US 6500306B2
- Authority
- US
- United States
- Prior art keywords
- white water
- bottom portion
- outlet
- arrangement
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
Definitions
- the present invention relates to an arrangement for the handling of white water from a paper machine, in which a channel is employed having an inlet end connected to an outlet for white water from a paper machine and having an outlet end that defines a main outlet for the white water to discharge into a container such as a white water silo.
- the invention relates more particularly to such an arrangement wherein the channel has a bottom that slopes downward in the flow direction with a certain angle of inclination relative to horizontal that is at least as great as a certain critical angle of inclination in order to avoid sedimentation on the channel bottom.
- the removal of air is made in the simplest possible way, i.e., by giving the white water a sufficiently long period of time for the air bubbles to rise to the surface and thus be removed from the water before the water is reused.
- a so-called white water channel is provided in a paper machine.
- the channel has a certain length and width as well as a certain flow rate all of which are selected to give the desired deaeration.
- the flow rate in the white water channel should not exceed 0.5 m/s to obtain good deaeration. Further, it is important to avoid turbulence, as there is otherwise a risk that the air bubbles will rotate down into the water again.
- the white water channel In order not to disturb the flow mode, sedimentation on the bottom of the white water channel should be avoided. To avoid such sedimentation, the white water channel is made to slope downward at a sufficient angle of inclination in the flow direction that fibers and other particles are carried to the outlet rather than settling on the bottom of the channel.
- the critical angle of inclination should be at least 2°, preferably at least 3°, in order to avoid sedimentation. In many installations, however, there is no possibility to provide the white water channel with a sufficiently large inclination, for instance when the height of the white water outlet from the paper machine is relatively low in combination with the white water silo being located at a large distance from the white water outlet of the paper machine.
- the present invention addresses the above needs and achieves other advantages, by providing an arrangement for handling white water from a paper machine, in which the critical angle of inclination of the white water channel can be achieved even when the running distance of the channel is relatively long considering the height difference between the paper machine's white water outlet and the main outlet of the channel.
- the arrangement comprises a white water channel having an inlet end for receiving white water from a paper machine and an opposite outlet end defining a main outlet through which the white water is discharged into a container, the channel having a channel bottom, the channel bottom sloping downward in a flow direction from the inlet end to the outlet end.
- an additional outlet is provided between the main outlet and the inlet end, the bottom having a first bottom portion that leads away from the inlet end up to the additional outlet and a second bottom portion that leads away from the additional outlet toward the main outlet.
- the first and second bottom portions are so arranged in relation to each other that each of the bottom portions slopes downward in the flow direction at an angle of inclination that exceeds a critical angle of inclination that avoids sedimentation on the bottom.
- the invention thus can eliminate the need to make changes in the existing floor surface on which the paper machine stands, and can reduce the cost of the construction.
- the additional outlet is formed through the bottom of the channel. It is further preferred that the first bottom portion slope downward from an upstream end to a downstream end thereof and the additional outlet is located substantially at the downstream end of the first bottom portion.
- the second bottom portion slopes downward from an upstream end to a downstream end thereof, and the upstream end of the second bottom portion is at a higher vertical level than the downstream end of the first bottom portion.
- a particularly preferred embodiment has the upstream ends of the first and second bottom portions located at substantially the same vertical level.
- the bottom of the channel includes an intermediate bottom portion between the first and second bottom portions, the intermediate bottom portion sloping upward from a downstream side of the additional outlet to the upstream end of the second bottom portion.
- the intermediate bottom portion has an angle of inclination larger, and preferably substantially larger, than that of either of the first and second bottom portions, for example between 5° and 60°.
- Each of the first and second bottom portions has an angle of inclination exceeding about 2°, more preferably exceeding about 2.5°, most preferably exceeding about 3°.
- the angles of inclination of the first and second bottom portions can be approximately equal.
- the bottom of the channel has a V-shaped configuration in transverse cross-section and the additional outlet is located at a lowest point of the transverse cross-section.
- the channel prefferably includes a third bottom portion following the second bottom portion and also sloping downward in the flow direction with an angle of inclination exceeding the critical angle of inclination.
- a second additional outlet is formed in the channel between the inlet end and the main outlet.
- FIG. 1 shows the principles for an arrangement according to a preferred embodiment of the invention
- FIG. 2 shows an alternative embodiment according to the invention.
- FIG. 3 shows a cross section through a white water channel according to the invention.
- FIG. 1 a preferred embodiment of a white water channel according to the invention is shown as well as the associated arrangement.
- An inlet end 1 of the channel is shown, which end is connected to a white water outlet 2 of a paper machine 3 .
- the paper machine 3 is arranged on a machine floor 11 , which constitutes a first floor level in the plant building. Below the machine floor 11 there is a bottom floor 12 , on which a white water silo 5 is located. This silo is arranged at the outlet end 4 of the white water channel and receives white water through a main outlet 6 of the channel.
- a pump 18 is provided to pump and/or to mix dilution water and the stock that is carried to the head box (not shown).
- the channel comprises a first bottom portion 8 A and a second bottom portion 8 B, which portions are inclined in the flow direction.
- the second bottom portion 8 B connects at its downstream end to the main outlet 6 at a vertical level H 0 , which substantially coincides with the level of the machine floor 11 .
- the upstream end of the second bottom portion lies at a vertical level H 3 that makes the bottom portion slope at a certain angle in relation to the horizontal plane. According to the preferred embodiment, this angle ⁇ 2 is about 3°.
- an additional outlet 9 to which an outlet pipe 10 is connected.
- a pump 14 is provided at the end of the outlet pipe 10 to pump the white water.
- the pump 14 is included in the reject circulation, such that the drained liquid can be used for dilution of the reject pulp.
- an intermediate bottom portion 8 D Leading from the downstream side of the additional outlet 9 there is an intermediate bottom portion 8 D, which is sloped upward in the flow direction at a relatively large angle ⁇ 3 in relation to the horizontal plane.
- the upstream end of the first bottom portion 8 A is at a vertical level H 1 that is about the same level as the vertical level H 3 of the upstream end of the second bottom portion 8 B, but as can be seen in the figure, the levels can be somewhat different and still maintain their functionality according to the invention. It should be observed that the level H 3 of the upstream end of the second bottom portion is not placed too high in relation to the liquid level in the white water channel, so that no detrimental turbulence can occur at this position. Normally, however, this risk does not exist, as the inclination is very small, which implies a low height of the construction.
- a wall portion 2 A is provided at the discharge end H m of the outlet of the paper machine, which wall portion is inclined at a large angle, preferably about 45°, downwards toward the upstream end of the first bottom portion 8 A.
- the purpose of this steeply inclined wall portion 2 A is to reduce the flow rate in the white water channel as rapidly as possible to provide a sufficiently low rate to avoid turbulence. Normally it is desired that the flow rate in the white water channel shall not exceed 0.5 m/s.
- the inclined bottom portions 8 A, 8 B have the same purpose, i.e., they slope to avoid or eliminate the establishment of turbulence in the white water channel.
- the angle must at least exceed 2° in order to avoid sediment being deposited on the channel bottom.
- a cutting of the existing machine floor 11 is necessary in order to obtain sufficient inclination downwards towards the silo. This has proved to be an undesirable solution, not the least from an economic point of view.
- the invention avoids having to cut the machine floor.
- FIG. 2 An alternative embodiment of the invention is shown in FIG. 2 .
- the bottom portion 8 is divided into:three different bottom portions 8 A, 8 B, 8 C.
- the height difference between the bottom end H m of the outlet of the machine 3 and the main outlet 6 is about the same as for the arrangement in FIG. 1, but the distance L from the paper machine outlet to the silo 5 is increased, thus exacerbating the problem of providing a sufficiently large inclination of the channel.
- a sufficient angle of inclination can be obtained when the bottom is divided into more than two sub-portions.
- the solution is in principle the same as described. above.
- the two additional outlets 9 , 13 are respectively connected to conduits 10 , 16 , which conduits are connected to each other through a connection conduit 15 , which preferably is also arranged at a certain angle of inclination.
- the single pump 14 can be used to pump this sub-flow further, for instance to a special reject pump, in order to dilute the reject before it is pumped further.
- FIG. 3 a cross section of a white water channel according to the invention is shown.
- the walls 5 A, 5 B are suitably vertically arranged and the bottom in transverse cross-section has a V-shaped configuration.
- sediment will not only move towards the outlets in the flow direction but also inwardly towards the centerline of the channel, which makes it possible to use a rather limited size of the outlet and still manage to remove sediment.
- a conventional conduit 10 at the additional outlet 9 the same principle is also applicable at the outlet 13 .
- the invention is not limited to what has been described above but can be varied within the scope of the appending patent claims. It should thus be understood that in principle a different number of bottom portions can be used to achieve the purpose of the invention. Further, it should be understood, that containers other than a silo 5 can be used to collect the white water. Further, it should be understood, that the sub-flows that are taken from the additional outlets preferably can be carried directly to devices other than a pump, for instance directly to a chest. It is also contemplated that a pump need not always be used to transport the liquid that has been drained through the outlet pipe (e.g., the conduit 10 ) but that a natural flow can advantageously be utilized in this connection.
- the outlet pipe e.g., the conduit 10
- the advantages of the invention can be utilized even if the levels H 1 and H 3 are not equal.
- the angles ⁇ 1 and ⁇ 2 need not be equal but such an arrangement in certain situations is preferred.
- the white water channel can be made of many different materials and combinations of different materials, such as concrete, plastics, metals, etc.
Landscapes
- Paper (AREA)
- Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
- Massaging Devices (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Domestic Plumbing Installations (AREA)
Abstract
Description
Claims (19)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/876,370 US6500306B2 (en) | 2000-06-09 | 2001-06-07 | Arrangement with white water channel |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0002164-2 | 2000-06-09 | ||
SE0002164 | 2000-06-09 | ||
SE0002164A SE516618C2 (en) | 2000-06-09 | 2000-06-09 | White water channel arrangement for handling white water from paper machine, has additional outlets that divide the channel's bottom into portions whose angle of inclination exceed critical angle of inclination |
US24494500P | 2000-11-01 | 2000-11-01 | |
US09/876,370 US6500306B2 (en) | 2000-06-09 | 2001-06-07 | Arrangement with white water channel |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020060029A1 US20020060029A1 (en) | 2002-05-23 |
US6500306B2 true US6500306B2 (en) | 2002-12-31 |
Family
ID=26655140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/876,370 Expired - Fee Related US6500306B2 (en) | 2000-06-09 | 2001-06-07 | Arrangement with white water channel |
Country Status (6)
Country | Link |
---|---|
US (1) | US6500306B2 (en) |
EP (1) | EP1290274B1 (en) |
AT (1) | ATE348913T1 (en) |
AU (1) | AU2001244995A1 (en) |
DE (1) | DE60125358T2 (en) |
WO (1) | WO2001094693A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10356576A1 (en) * | 2003-12-04 | 2005-07-07 | Voith Paper Patent Gmbh | Method for guiding white water which accumulates openly on a paper machine |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB189800377A (en) | 1898-01-06 | 1898-08-20 | Gordon Mcneill | A Separator for Removing any Matter in Suspension in the Backwater from a Paper Making Machine. |
US1620860A (en) * | 1926-01-11 | 1927-03-15 | Carlton H Allen | Process and apparatus for making paper or the like |
US1629607A (en) * | 1926-09-08 | 1927-05-24 | Jr George Stanford Witham | Fourdrinier machine and process of paper making |
US1670874A (en) * | 1925-11-24 | 1928-05-22 | Bankus Albert | Means for reclaiming suspended solids from white water of paper manufacture |
US3801436A (en) | 1970-05-14 | 1974-04-02 | Voith Gmbh J M | Fibrous web forming machine with white water recirculating arrangement |
WO1983002293A1 (en) | 1981-12-30 | 1983-07-07 | Nils Anders Lennart Wikdahl | Method and plant for deaerating fibre suspensions |
GB2179073A (en) | 1985-07-30 | 1987-02-25 | Escher Wyss Gmbh | Apparatus for decelerating fast-flowing white water |
WO1993023612A1 (en) | 1992-05-19 | 1993-11-25 | Pom Technology Oy Ab | Process and apparatus for circulating backwater in a papermaking machine |
DE29916787U1 (en) | 1999-09-23 | 1999-12-30 | Voith Sulzer Papiertechnik Patent GmbH, 88213 Ravensburg | Device for guiding white water from a paper machine |
US6200417B1 (en) * | 1998-06-29 | 2001-03-13 | Voith Sulzer Papiertechnik Patent Gmbh | Process and device for mixing stock suspensions |
-
2001
- 2001-04-04 AT AT01918129T patent/ATE348913T1/en not_active IP Right Cessation
- 2001-04-04 WO PCT/SE2001/000732 patent/WO2001094693A1/en active IP Right Grant
- 2001-04-04 DE DE60125358T patent/DE60125358T2/en not_active Expired - Fee Related
- 2001-04-04 AU AU2001244995A patent/AU2001244995A1/en not_active Abandoned
- 2001-04-04 EP EP01918129A patent/EP1290274B1/en not_active Expired - Lifetime
- 2001-06-07 US US09/876,370 patent/US6500306B2/en not_active Expired - Fee Related
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB189800377A (en) | 1898-01-06 | 1898-08-20 | Gordon Mcneill | A Separator for Removing any Matter in Suspension in the Backwater from a Paper Making Machine. |
US1670874A (en) * | 1925-11-24 | 1928-05-22 | Bankus Albert | Means for reclaiming suspended solids from white water of paper manufacture |
US1620860A (en) * | 1926-01-11 | 1927-03-15 | Carlton H Allen | Process and apparatus for making paper or the like |
US1629607A (en) * | 1926-09-08 | 1927-05-24 | Jr George Stanford Witham | Fourdrinier machine and process of paper making |
US3801436A (en) | 1970-05-14 | 1974-04-02 | Voith Gmbh J M | Fibrous web forming machine with white water recirculating arrangement |
WO1983002293A1 (en) | 1981-12-30 | 1983-07-07 | Nils Anders Lennart Wikdahl | Method and plant for deaerating fibre suspensions |
GB2179073A (en) | 1985-07-30 | 1987-02-25 | Escher Wyss Gmbh | Apparatus for decelerating fast-flowing white water |
WO1993023612A1 (en) | 1992-05-19 | 1993-11-25 | Pom Technology Oy Ab | Process and apparatus for circulating backwater in a papermaking machine |
US6200417B1 (en) * | 1998-06-29 | 2001-03-13 | Voith Sulzer Papiertechnik Patent Gmbh | Process and device for mixing stock suspensions |
DE29916787U1 (en) | 1999-09-23 | 1999-12-30 | Voith Sulzer Papiertechnik Patent GmbH, 88213 Ravensburg | Device for guiding white water from a paper machine |
Also Published As
Publication number | Publication date |
---|---|
WO2001094693A1 (en) | 2001-12-13 |
ATE348913T1 (en) | 2007-01-15 |
US20020060029A1 (en) | 2002-05-23 |
AU2001244995A1 (en) | 2001-12-17 |
DE60125358D1 (en) | 2007-02-01 |
EP1290274A1 (en) | 2003-03-12 |
DE60125358T2 (en) | 2007-09-27 |
EP1290274B1 (en) | 2006-12-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: METSO PAPER KARLSTAD AB, SWEDEN Free format text: CHANGE OF NAME;ASSIGNOR:VALMET-KARLSTAD AB;REEL/FRAME:012884/0731 Effective date: 20010316 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: METSO PAPER INC, FINLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:METSO PAPER KARLSTAD AB;REEL/FRAME:014428/0240 Effective date: 20031010 |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20101231 |
|
AS | Assignment |
Owner name: VALMET TECHNOLOGIES, INC., FINLAND Free format text: CHANGE OF NAME;ASSIGNOR:METSO PAPER, INC.;REEL/FRAME:032551/0426 Effective date: 20131212 |